\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{circuitikz}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes}
\ctikzset{bipoles/length=1cm}
\begin{document}
\small
\begin{circuitikz}[>=latex, yscale=.5]
  % \useasboundingbox(0.9,0)rectangle(5.1,5);
  \draw (0,0)--(5,0)node[right]{$D$} to [rmeter, t=G] (5,4)node[right]{$C$}--(0,4)node[left]{$F$} to [rmeter, t=G] (0,0) node[left]{$E$};
  \foreach \x in {.5,1.0,...,4.5}
  \foreach \y in {.5,1.5,2.5,3.5}
  {
     \node at  (\x,\y) {$\times$};
  }
  \node at (2.7,-.75)[above left]{$A$};
  \node at (2.7,4.75)[below left]{$B$};
  \fill [left color=lightgray,right color=lightgray,middle color=white](2.7,4.5) rectangle (2.9,-.5);
  \draw [->](2.9, 2)--(3.8,2)node[right]{$v$};
\end{circuitikz}
\end{document}